A medic’s a prophet (4)

I believe the answer is:

amos

'a prophet' is the definition.
(biblical prophet)

'a medic's' is the wordplay.
'medic's' becomes 'mo's' (medical officer).
'a'+'mos'='AMOS'

(Other definitions for amos that I've seen before include "Old Testament prophet" , "Biblical character" , "Prophet in the Bible" , "Old Testament book" , "Hebrew prophet" .)

I've seen this clue in The Guardian.

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